Rock | Definition, History, Artists, Songs, & Facts | Britannica
Rock is a form of popular music that emerged in the 1950s and that by the end of the 20th century was the world’s dominant form of popular music. It originated in the United States and spread to other …
Rock | Definition, Characteristics, Formation, Cycle, Classification ...
Nov 25, 2025 · Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form …
Rock River | Wisconsin, Illinois, & Map | Britannica
Rock River, nonnavigable stream in the north-central United States that originates north of Horicon Marsh, near Brandon in Fond du Lac county, eastern Wisconsin, and flows in a generally …
Rock - Pioneers, Genres, Legends | Britannica
Rock history can thus be organized around both the sound of cities (Philadelphia and Detroit, New York City and San Francisco, Liverpool and Manchester) and the spread of youth cults (rock and roll, …
Rock Island | Mississippi River, Quad Cities, Fort Armstrong | Britannica
Rock Island, city, seat (1833) of Rock Island county, northwestern Illinois, U.S. It lies on the Mississippi River (bridged to Iowa) at the mouth of the Rock River and opposite the island for which it was named.
Rock and Roll Hall of Fame and Museum - Encyclopedia Britannica
Nov 24, 2025 · rock and roll, style of popular music that originated in the United States in the mid-1950s and that evolved by the mid-1960s into the more encompassing international style known as rock …
Rock and roll | History, Songs, Artists, & Facts | Britannica
Nov 21, 2025 · Rock and roll, style of popular music that originated in the United States in the mid-1950s and that evolved by the mid-1960s into the more encompassing international style known as rock …
Rock - Social Change, Cultural Evolution, Music Revolution | Britannica
Rock remains the most democratic of mass media—the only one in which voices from the margins of society can still be heard out loud. Yet, at the beginning of the 21st century, rock and the music …
Igneous rock | Characteristics, Examples, Formation, & Types - Britannica
4 days ago · Igneous rocks are formed from the solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock material. Earth is composed predominantly of a …
Chris Rock | Biography, Movies, TV Shows, & Facts | Britannica
Dec 19, 2025 · Chris Rock (born February 7, 1966, Georgetown, South Carolina, U.S.) is an American comedian whose popular stand-up routine, which often addressed racial matters, led to a successful …